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Attwood Marine 66551-3 Stainless Steel Thru-Hull Fitting 1-1/2 Inch

Manufacturer

Attwood Marine

<h3>About Attwood Marine</h3><p><strong>Attwood Marine</strong> has been a cornerstone of the boating world for well over a century. <a href="/7239-attwood-marine">Founded in 1893</a>, the company began by manufacturing precision underwater hardware and on-deck fittings — rudders, struts, cleats, and lights — and quickly earned a reputation for fine engineering and enduring quality. After World War I, the brand's craftsmanship was so well regarded that legendary boatbuilder Chris-Craft turned to Attwood for brass fittings on their iconic pleasure boats.</p><p>Today, Attwood operates as part of the Navico Group by Brunswick, a global family of industry-leading marine companies, yet it has never lost the boater-first focus that built its name. What distinguishes Attwood from many competitors is their end-to-end philosophy: they design, manufacture, test, and distribute their own products rather than simply sourcing components from third parties. Every item in the Attwood catalog is rigorously tested to meet or exceed U.S. Coast Guard (USCG), American Boat and Yacht Council (ABYC), and CE standards — giving boaters and OEM manufacturers alike the confidence to rely on Attwood gear season after season.</p><h3>A Complete Marine Accessories Ecosystem</h3><p>Attwood's catalog spans an impressively broad range of marine needs. On the comfort and ergonomics side, their <a href="/7239-attwood-marine-seat-pedestal-packages-200926">Seat &amp; Pedestal Packages</a> deliver complete, ready-to-install seating system solutions backed by decades of engineering refinement. For boaters who prefer to build or customize their setup, Attwood's Fixed Mount Pedestals provide a sturdy, reliable foundation engineered for lasting stability on the water.</p><p>When it comes to protecting your hull at the dock, Attwood's <a href="/7239-attwood-marine-fenders-200396">Fenders</a> offer dependable, marine-grade cushioning against docks, pilings, and other vessels — an often-overlooked but essential piece of gear for every boat owner. Getting on and off the boat safely is equally important, and Attwood's <a href="/200179-boarding-ladders-attwood-marine-7239">Boarding Ladders</a> are designed with heavy-duty construction, rated hardware, and user-friendly features to make every entry and exit as secure as possible.</p><p>Beyond these categories, Attwood is also widely recognized for its bilge and aerator pumps, navigation lighting, fuel systems, rod holders, and trailering accessories — making the brand a true one-stop resource for outfitting or refreshing virtually any powerboat, fishing boat, or recreational vessel.</p><h3>Why Boaters Choose Attwood</h3><ul style="list-style:disc"><li><strong>100+ Years of Proven Experience</strong> — A heritage of quality engineering stretching back to 1893.</li><li><strong>Multi-Standard Compliance</strong> — Products tested to USCG, ABYC, and CE standards for safety and performance.</li><li><strong>OEM-Trusted</strong> — A leading supplier to major boat manufacturers across a wide range of product categories.</li><li><strong>Corrosion-Resistant Materials</strong> — Extensive use of 304 and 316 stainless steel, chrome-plated zinc, and marine-grade synthetics built for harsh saltwater environments.</li><li><strong>In-House Engineering</strong> — Advanced prototyping, simulation, and real-world testing ensure reliability before any product reaches the water.</li></ul>

Part Number

66551-3
09/14/2036 6:15 AM
Sale Price

$44.52

In Stock (5)

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Usually delivered within 2 days

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Fitment guaranteed

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Product Details

The Attwood Marine 66551-3 is a premium thru-hull fitting designed for reliable water system connections in marine applications. Cast from corrosion-resistant 316 stainless steel, this fitting provides exceptional durability in harsh saltwater environments.

Key Features:

  • 316 stainless steel construction for maximum corrosion resistance
  • 1-1/2 inch diameter for standard marine hose connections
  • Integrated sealant channel under flange for watertight installation
  • Wrench flats or end notch for easy installation and removal
  • Designed for above-waterline installation only

This thru-hull fitting is ideal for livewell systems, washdown pumps, bilge pump discharges, and other marine plumbing applications where water lines pass through the hull. The built-in channel under the flange holds a bead of marine sealant to ensure a secure, leak-proof connection. The wrench flats provide positive grip during installation without damaging the fitting.

Important: This fitting must be installed above the waterline only. Not suitable for below-waterline applications.

Products specifications

Flange

3"

Hose

1-1/2"

Hose Size

1-1/2" I.D.

Install Hole Saw Size

2"

Length

4-1/8"

Quick and easy!

Great company to deal with. Would recommend them every chance i can

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Lowest pricing on the internet, was very easy and PayPal pay worked perfectly.

No way to contact for more information,not no pictures of real idome

I love shoppung and finding great deals

Was fast and easy to look for parts and order.

Great truck rack / product as expected and quick shipping. Will shop with again for sure, thanks.

had to try to check out several times. server stated vender a error. I only ordered one power steering pump. i hope i don't get billed for a dozen???

So far so good...

so far so good!

quick checkout

Best Price and fast shipping, not bad price for the shipping cost

hope shipping is fast

Easy to order quick response and got what I wanted.It is very hard to trust a online store curently, but Autoplictity will be on top of my list.

Great prices and prompt shipping

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